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Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea
Shi, XB; Burov, E; Leroy, S; Qiu, XL; Xia, B; xbshi@scsio.ac.cn
2005
发表期刊TECTONOPHYSICS
ISSN0040-1951
卷号407期号:40545页码:117-134
摘要We develop a series of simple numerical models to explain the anomalous subsidence and deposition phenomena on the northern continental margin of the South China Sea, in particular in the Baiyun Sag. The results suggest that a short-period high rate deposition of around 17 Ma is related to a rapid subsidence event, which may be due to episodic emplacement of a dense intrusion. Necking and gravity models indicate that in the basement of the Baiyun Sag, there is a dense zone that is 100-200 kg/m(3) more dense than the surrounding country rock. Considering its high magnetic intensity and regional igneous activity, the dense zone is thought to be related to a phase of basalt intrusion that may have taken place around 17 Ma. Thermal and subsidence models indicate that a hot denser intrusion can cause significant subsidence immediately after the intrusion. The subsidence rate then slows down with cooling, thus becoming consistent with the observed subsidence curves at around 17 Ma. The results also indicate that the lithospheric strength under the Baiyun Sag is negligible, and that the high-velocity layer in the lowermost crust may be not an original part of the pre-rift crust. Instead, it is thought to be underplated intrusion emplaced at around 30 Ma when the continental margin broke up. (c) 2005 Elsevier B.V. All rights reserved.
部门归属Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; Univ Paris 06, UMR 7072, Lab Tecton, Paris, France; Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China
关键词Intrusion Subsidence High Velocity Layer South China Sea
学科领域Geochemistry & Geophysics
收录类别sci
资助项目海洋地质
WOS记录号WOS:000232815100007
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4842
专题中科院边缘海地质重点实验室
通讯作者xbshi@scsio.ac.cn
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GB/T 7714
Shi, XB,Burov, E,Leroy, S,et al. Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea[J]. TECTONOPHYSICS,2005,407(40545):117-134.
APA Shi, XB,Burov, E,Leroy, S,Qiu, XL,Xia, B,&xbshi@scsio.ac.cn.(2005).Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea.TECTONOPHYSICS,407(40545),117-134.
MLA Shi, XB,et al."Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea".TECTONOPHYSICS 407.40545(2005):117-134.
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